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Chavers Mining Resource Integrated Noxious Weed Management Plan January 2024 Page 11 improperly, or under unfavorable environmental conditions (see "Wind", "Temperature and Humidity", and"Temperature Inversions"). CONTROLLING DROPLET SIZE ■ Volume—Use high flow rate nozzles to apply the highest practical spray volume. Nozzles with higher rated flows produce larger droplets. ■ Pressure—Do not exceed the nozzle manufacturer's recommended pressures. For many nozzle types lower pressure produces larger droplets. When higher flow rates are needed, use higher flow rate nozzles instead of increasing pressure. ■ Number of Nozzles—Use the minimum number of nozzles that provide uniform coverage. ■ Nozzle Orientation—Orienting nozzles so that the spray is released parallel to the airstream produces larger droplets than other orientations and is the recommended practice. Significant deflection from horizontal will reduce droplet size and increase drift potential. ■ Nozzle Type—Use a nozzle type that is designed for the intended application. With most nozzle types,narrower spray angles produce larger droplets. Consider using low-drift nozzles. Solid stream nozzles oriented straight back produce the largest droplets and the lowest drift. ■ Boom Length—For some use patterns, reducing the effective boom length to less than 3/4 of the wingspan or rotor length may further reduce drift without reducing swath width. ■ Application Height—Applications should not be made at a height greater than 10 feet above the top of the largest plants unless a greater height is required for aircraft safety. Making applications at the lowest height that is safe reduces exposure of droplets to evaporation and wind. SWATH ADJUSTMENT When applications are made with a crosswind, the swath will be displaced downwind. Therefore, on the up and downwind edges of the field, the applicator must compensate for this displacement by adjusting the path of the aircraft upwind. Swath adjustment distance should increase with increasing drift potential(higher wind, smaller drops, etc.). WIND Drift potential is lowest between wind speeds of 2 —10 mph. However, many factors, including droplet size and equipment type determine drift potential at any given speed. Application should be avoided below 2 mph due to variable wind direction and high inversion potential. Do not apply by air when wind speed is greater than 8 mph. Do not apply by ground when wind speed is greater than 10 mph.